<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="lib/vue-2.4.0.js"></script>
</head>

<body>
    <div id="app">
        <!-- <input type="button" value="toggle" @click="toggle"> -->
        <input type="button" value="toggle" @click="flag=!flag">
        <h3 v-if="flag">这是用v-if控制的元素</h3>
        <h3 v-show="flag">这是用v-show控制的元素</h3>
    </div>

    <script>
        var vm = new Vue({
            el: '#app',
            data: {
                flag: true
            },
            methods: {
                // toggle() {
                //     this.flag = !this.flag
                // }
            }
        })
    </script>
</body>

</html>